# Maintainer: Milan P. Stanić <mps@arvanta.net>

_flavor=starfive
pkgname=linux-${_flavor}
pkgver=6.8.7
case $pkgver in
	*.*.*)	_kernver=${pkgver%.*};;
	*.*) _kernver=$pkgver;;
esac
pkgrel=0
pkgdesc="starfive (development kernel)"
url="https://www.kernel.org"
depends="initramfs-generator"
_depends_dev="perl gmp-dev elfutils-dev flex bison"
makedepends="$_depends_dev sed bc linux-headers installkernel pigz
	linux-firmware-any openssl-dev diffutils findutils python3"
options="!strip !check"
_config=${config:-config-$_flavor.${CARCH}}

subpackages="$pkgname-dev:_dev:$CBUILD_ARCH"
source="https://cdn.kernel.org/pub/linux/kernel/v${pkgver%%.*}.x/linux-$_kernver.tar.xz"
case $pkgver in
	*.*.0)	source="$source";;
	*.*.*)	source="$source
	https://cdn.kernel.org/pub/linux/kernel/v${pkgver%%.*}.x/patch-$pkgver.xz" ;;
esac
	source="$source
	config-starfive.riscv64
	aurel32.6.7.y.patch
	"

builddir="$srcdir/linux-${_kernver}"
arch="riscv64"
license="GPL-2.0-only"

unset _flavors
for _i in $source; do
	case $_i in
	config-*.$CARCH)
		_f=${_i%.$CARCH}
		_f=${_f#config-}
		_flavors="$_flavors ${_f}"
		if [ "linux-$_f" != "$pkgname" ]; then
			subpackages="$subpackages linux-${_f}::$CBUILD_ARCH linux-${_f}-dev:_dev:$CBUILD_ARCH"
		fi
		;;
	esac
done

_carch=${CARCH}
case "$_carch" in
aarch64*) _carch="arm64" ;;
arm*) _carch="arm" ;;
riscv64) _carch="riscv" ;;
esac

prepare() {
	local _patch_failed=
	case $pkgver in
		*.*.0);;
		*)
		msg "Applying patch-$pkgver.xz"
		unxz -c < "$srcdir"/patch-$pkgver.xz | patch -p1 -N ;;
	esac

	# first apply patches in specified order
	mkdir drivers/pci/controller/plda
	cp drivers/pci/controller/pcie-microchip-host.c drivers/pci/controller/plda/pcie-microchip-host.c
	for i in $source; do
		case $i in
		*.patch)
			msg "Applying $i..."
			if ! patch -s -p1 -N -i "$srcdir"/$i; then
				echo $i >>failed
				_patch_failed=1
			fi
			;;
		esac
	done

	if ! [ -z "$_patch_failed" ]; then
		error "The following patches failed:"
		cat failed
		return 1
	fi
	# remove localversion from patch if any
	rm -f localversion*
	oldconfig
}

oldconfig() {
	for i in $_flavors; do
		local _config=config-$i.${CARCH}
		echo "-$pkgrel-$i" > "$builddir"/localversion-alpine \
			|| return 1

		cp "$srcdir"/$_config "$builddir"/.config
		make -C $builddir \
			O="$builddir" \
			ARCH="$_carch" \
			listnewconfig oldconfig
	done
}

build() {
	unset LDFLAGS
	export KBUILD_BUILD_TIMESTAMP="$(date -Ru${SOURCE_DATE_EPOCH:+d @$SOURCE_DATE_EPOCH})"
	make ARCH="$_carch" DTC_FLAGS="-@" CC="${CC:-gcc}" \
		KBUILD_BUILD_VERSION="$((pkgrel + 1 ))-Alpine"
}

_package() {
	local _buildflavor="$1" _outdir="$2"
	local _abi_release=${pkgver}-${pkgrel}-${_buildflavor}
	export KBUILD_BUILD_TIMESTAMP="$(date -Ru${SOURCE_DATE_EPOCH:+d @$SOURCE_DATE_EPOCH})"

	# modules_install seems to regenerate a defect Modules.symvers on s390x. Work
	# around it by backing it up and restore it after modules_install
	cp Module.symvers Module.symvers.backup

	mkdir -p "$_outdir"/boot "$_outdir"/lib/modules

	local _install
	case "$CARCH" in
		arm*|aarch64) _install="zinstall dtbs_install";;
		riscv64) _install="zinstall dtbs_install";;
		*) _install=install;;
	esac

	make -j1 modules_install $_install \
		ARCH="$_carch" \
		INSTALL_MOD_PATH="$_outdir" \
		INSTALL_PATH="$_outdir"/boot \
		INSTALL_DTBS_PATH="$_outdir/boot/dtbs-$_buildflavor"

	cp Module.symvers.backup Module.symvers

	rm -f "$_outdir"/lib/modules/${_abi_release}/build \
		"$_outdir"/lib/modules/${_abi_release}/source
	rm -rf "$_outdir"/lib/firmware

	install -D -m644 include/config/kernel.release \
		"$_outdir"/usr/share/kernel/$_buildflavor/kernel.release
	cp "$builddir"/.config $pkgdir/boot/config-$_flavor

}

# main flavor installs in $pkgdir
package() {
	depends="$depends linux-firmware-any"

	_package $_flavor "$pkgdir"
}

_dev() {
	local _flavor=$(echo $subpkgname | sed -E 's/(^linux-|-dev$)//g')
	local _abi_release=${pkgver}-${pkgrel}-$_flavor
	# copy the only the parts that we really need for build 3rd party
	# kernel modules and install those as /usr/src/linux-headers,
	# simlar to what ubuntu does
	#
	# this way you dont need to install the 300-400 kernel sources to
	# build a tiny kernel module
	#
	pkgdesc="Headers and script for third party modules for $_flavor kernel"
	depends="$_depends_dev"
	local dir="$subpkgdir"/usr/src/linux-headers-${_abi_release}
	export KBUILD_BUILD_TIMESTAMP="$(date -Ru${SOURCE_DATE_EPOCH:+d @$SOURCE_DATE_EPOCH})"

	# first we import config, run prepare to set up for building
	# external modules, and create the scripts
	mkdir -p $dir
	cd $builddir
	cp "$srcdir"/config-$_flavor.${CARCH} "$dir"/.config
	echo "-$pkgrel-$_flavor" > "$dir"/localversion-alpine

	echo "Installing headers..."
	cp -t $dir -a $builddir/include
echo "**********"
	install -Dt $dir -m644 $builddir/Makefile
	install -Dt $dir -m644 $builddir/Module.symvers
	install -Dt $dir -m644 $builddir/System.map
	cp -t $dir -a $builddir/scripts

echo "***********************************"
	install -Dt "${dir}/arch/${_carch}" -m644 $builddir/arch/${_carch}/Makefile
	install -Dt "${dir}/arch/${_carch}/kernel" -m644 $builddir/arch/${_carch}/kernel/asm-offsets.s
	cp -t "${dir}/arch/${_carch}" -a $builddir/arch/${_carch}/include

echo "***********************************"
	install -Dt "$dir/drivers/md" -m644 drivers/md/*.h
	install -Dt "$dir/net/mac80211" -m644 net/mac80211/*.h

	# https://bugs.archlinux.org/task/13146
	install -Dt "$dir/drivers/media/i2c" -m644 drivers/media/i2c/msp3400-driver.h

	# https://bugs.archlinux.org/task/20402
	install -Dt "$dir/drivers/media/usb/dvb-usb" -m644 drivers/media/usb/dvb-usb/*.h
	install -Dt "$dir/drivers/media/dvb-frontends" -m644 drivers/media/dvb-frontends/*.h
	install -Dt "$dir/drivers/media/tuners" -m644 drivers/media/tuners/*.h

	# https://bugs.archlinux.org/task/71392
	install -Dt "$dir/drivers/iio/common/hid-sensors" -m644 drivers/iio/common/hid-sensors/*.h

	echo "Installing KConfig files..."
	find . -name 'Kconfig*' -exec install -Dm644 {} "$builddir/{}" \;

	echo "Removing unneeded architectures..."
	local arch
	for arch in "$dir"/arch/*/; do
		case $(basename "$arch") in $_carch) continue ;; esac
		echo "Removing $(basename "$arch")"
		rm -r "$arch"
	done

	echo "Removing broken symlinks..."
	find -L "$builddir" -type l -printf 'Removing %P\n' -delete

	echo "Removing loose objects..."
	find "$builddir" -type f -name '*.o' -printf 'Removing %P\n' -delete

	echo "Stripping build tools..."
	local file
	while read -rd '' file; do
		case "$(file -bi "$file")" in
			application/x-sharedlib\;*)      # Libraries (.so)
				strip -v $STRIP_SHARED "$file" ;;
			application/x-archive\;*)        # Libraries (.a)
				strip -v $STRIP_STATIC "$file" ;;
			application/x-executable\;*)     # Binaries
				strip -v $STRIP_BINARIES "$file" ;;
			application/x-pie-executable\;*) # Relocatable binaries
				strip -v $STRIP_SHARED "$file" ;;
		esac
	done < <(find "$builddir" -type f -perm -u+x ! -name vmlinux -print0)

	echo "Stripping vmlinux..."
	strip -v $STRIP_STATIC "$builddir/vmlinux"

	echo "Adding symlink..."
	mkdir -p "$subpkgdir"/lib/modules/${_abi_release}
	ln -sf /usr/src/linux-headers-${_abi_release} \
		"$subpkgdir"/lib/modules/${_abi_release}/build
}

sha512sums="
5c4eb4aa1d3f7d1ea01c0f7ddeadacdece6e144fd4bdfc16b2b925d3e10dc04de3a6db69320b79a96c3560052616f001d2c09e7a1bb4f7b731e2380a7ecce068  linux-6.8.tar.xz
19f6ff889e643bd46bce57ff9312900ab2bf866a8c2eaf0ab545bd6f4189872346c861672babbff991dbb04e3ef1a9b805aaac491d660482bdedc30af5922a0c  patch-6.8.7.xz
9d6ec9c178d5fb35669ad8f9ea86374bc26fbe998be8f285bfb2b891d6a53b0aa9ed5b0c8023e9322868488546a20dbbf5aeca2612f8813e5ade18ba3ae28f62  config-starfive.riscv64
6031bfd1d002e7e12a32ca7d0f91ed642045c2ff205a8c256d9818cd16688c8ca44bd22fec4daa345b896cc86744efb19d41711a6c14241baddd2b19ff3bc6a9  aurel32.6.7.y.patch
"
